http://youtu.be/KJCew8qq2_oNot sure how you put the video in the post but this link has another that's pretty cool, but it isn't TNT powered, but villager powered.Found it while figuring out how to make a TNT cannon.

http://youtu.be/KJCew8qq2_oNot sure how you put the video in the post but this link has another that's pretty cool, but it isn't TNT powered, but villager powered.Found it while figuring out how to make a TNT cannon.